package Global;

import javax.swing.JOptionPane;
import java.util.Arrays;

public class BrowserLauncher
{
    static final String[] browsers =
    {
        "google-chrome", "firefox", "opera",
        "epiphany", "konqueror", "conkeror", "midori", "kazehakase", "mozilla"
    };
    static final String errMsg = "Error attempting to launch web browser";

    /**
     * Opens the specified web page in the user's default browser
     * @param url A web address (URL) of a web page (ex: "http://www.google.com/")
     */
    public static void openURL(String url)
    {
        try
        {  //attempt to use Desktop library from JDK 1.6+
            Class<?> d = Class.forName("java.awt.Desktop");
            d.getDeclaredMethod("browse", new Class[]
                    {
                        java.net.URI.class
                    }).invoke(
                    d.getDeclaredMethod("getDesktop").invoke(null),
                    new Object[]
                    {
                        java.net.URI.create(url)
                    });
            //above code mimicks:  java.awt.Desktop.getDesktop().browse()
        }
        catch (Exception ignore)
        {  //library not available or failed
            String osName = System.getProperty("os.name");
            try
            {
                if (osName.startsWith("Mac OS"))
                {
                    Class.forName("com.apple.eio.FileManager").getDeclaredMethod(
                            "openURL", new Class[]
                            {
                                String.class
                            }).invoke(null,
                            new Object[]
                            {
                                url
                            });
                }
                else if (osName.startsWith("Windows"))
                    Runtime.getRuntime().exec(
                            "rundll32 url.dll,FileProtocolHandler " + url);
                else
                { //assume Unix or Linux
                    String browser = null;
                    for (String b : browsers)
                    {
                        if (browser == null && Runtime.getRuntime().exec(new String[]
                                {
                                    "which", b
                                }).getInputStream().read() != -1)
                            Runtime.getRuntime().exec(new String[]
                                    {
                                        browser = b, url
                                    });
                    }
                    if (browser == null)
                        throw new Exception(Arrays.toString(browsers));
                }
            }
            catch (Exception e)
            {
                JOptionPane.showMessageDialog(null, errMsg + "\n" + e.toString());
            }
        }
    }
}
